* [stm32f401-nucleo] arduino support
* 增加application arduino main文件
* 调整目录结构

* Microchip SAM MCU BSP update and add ethernet driver

1. Update Microchip SAM MCU BSP, add I2C, GMAC, ADC driver support. 2. Add ethernet driver support of SAM MCU for RT-Thread.

* Add GMAC and I2C driver support

1. Update MCU BSP to support I2C/ADC/GMAC peripherals. 2. Add I2C and ethernet driver and LWIP support. 3. Update serial driver.

* Add I2C driver and move some files to the common folder

1. Add I2C driver. 2. Move the same drivers and demo code to same folder to reduce duplicated code.

* rt1052 添加 RT-Thread Studio 工程

[stm32f072] support Arduino I2C and update readme

- add comments
- remove ARDUINO_PWM_HZ
- remove initVariant blank function
- support DAC0
- improve Kconfig of STM32L475 PANDORA
- add readme
- add i2c1 bus device

删除多余注释，另外确定了对于其他型号单片机的适应性

* Add Microchip SAM series MCU support for RT-Thread

Add Microchip SAM series MCU support for RT-Thread, including SAM Cortex-M0+, M4F and M7.

* Add bsp directory to ignored check list

Add bsp directory to ignored check list, add microchip /samc21/same54/same70 to workflows list

* remove STDIO definition and bug fix

1. remove STDIO code from Microchip official BSP. 2. bug fix of SAME70 hpl/hpl_usart.c, samc21&same54 hpl/hpl_sercom.c baudrate update interface.  3. Add RT-Thread standard STDIO implementation on Microchip SAM MCU.

* add CAN driver & example and script fix

Add CAN driver and example for SAMC21/SAME5x/SAME70 and fix rtconfig.py issue(unused space might result link error)

* Add Chinese version README

Add Chinese version README for SAMC21/E54/E70

* Update n32_msp.c
* 添加SPI3的初始化代码
* 修正spi收发函数卡死在SPI_I2S_GetStatus的BUG

* fix:修复i2c异常问题

* add:格式化代码格式

[bsp/stm32] fix the bug of 'can' being stucked when short cricuit the canH and canL, change some wrong annotations

[stm32F4] adapt 168M frequency of 1M can baud, remember to add the define of BSP_USING_CAN168M in kconfig while using 168M frequency

* [bsp] Make all warnings into errors with qemu-vexpress-a9 qemu-virt64-aarch64 and stm32f411-st-nucleo.
* [RTC] Fix compile errors

* 1、添加基于STM32WLE5JC的BSP
2、修正stm32wlxx的引用

* edit readme

- [libc] 解决由于类unix操作系统发展历史原因fcntl.h定义的标志位在不同编译器中定义不同的问题
- [simulator] 部分宏定义转为全局宏定义以确保vs内置文件可以正确配置
- [simulator] 取消自欺欺人式的警告消除处理方式
- [libc][time] 优化time相关结构体在不同编译器下的包含

feat: move MRS demo source to bsp and libraries folder

feat: update Sconscript

feat: modify SConstruct in the bsp

feat: use the rtconfig.py of gd32vf103v-eval bsp to modify

feat: use the MRS's rtconfig.h temoporarily

feat: update Kconfig files

feat: use the MRS's .ld and rename as link.lds

feat: add ch32v1 porting folder

perf: remove board/system_ch32v10x.c

fix: define SOC_ARM_SERIES_CH32V103 in rtconfig.h

fix: add some neccessary macros in rtconfig.h

perf: use the menuconfig to generate rtconfig.h

feat: add readme.md

fix: correct the bad encode in main.c

fix: include board.h in main.c

perf: check and update README.md

perf: remove ch32f10x_port_cn.md

feat: ignore the standard libraries's CI checking

feat: add sdk_dist.py

fix: correct some style errors again

perf: simply the board/kconfig

fix: format ch32v103r-evt

fix: format drvs and libcpu

* [stm32] fix h7 uart V2 driver unused code.

* [DeviceDriver][serialv2] fix the serialv2 when using for console device on DMA mode.

* [stm32][art-pi] using serial v2 by default

* [DeviceDriver][SerialV2] Add termios for serial@V2 .

* [BSP][STM32] Add hardware flow control for STM32 serial@V2 driver.

* [DeviceDriver][Serial@V2] Add hardware flow control for serial V2.